616501609 has 4 divisors (see below), whose sum is σ = 616873104. Its totient is φ = 616130116.

The previous prime is 616501603. The next prime is 616501649. The reversal of 616501609 is 906105616.

616501609 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 616501609 - 2¹¹ = 616499561 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (616501603) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 183247 + ... + 186580.

It is an arithmetic number, because the mean of its divisors is an integer number (154218276).

Almost surely, 2^616501609 is an apocalyptic number.

It is an amenable number.

616501609 is a deficient number, since it is larger than the sum of its proper divisors (371495).

616501609 is a wasteful number, since it uses less digits than its factorization.

616501609 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 371494.

The product of its (nonzero) digits is 9720, while the sum is 34.

The square root of 616501609 is about 24829.4504369307. The cubic root of 616501609 is about 851.0950633538.

The spelling of 616501609 in words is "six hundred sixteen million, five hundred one thousand, six hundred nine".